Matsushita Electric Industrial Co., Ltd.

Noriyoshi Kato

Misa Kasahara

Yukio Fujita

Toshiyuki Sano

Keiji Toyoda

In a motion detection circuit, a difference signal between the video and one-frame delayed video signals is generated Edge signals are generated from the video and delayed video signals. Motion in a target pixel is judged from the interframe difference signal according to the edge signals. A motion judging circuit further includes an LPF and a selector for supplying an output of the LPF or the difference signal. The motion judging circuit includes a polarity deviation detecting circuit for judging the motion as moving in the presence of agreement of the polarities of all pixels at any of peripheral areas around the target pixel. The size of the peripheral areas are controlled. The motion judging circuit may further includes a peripheral pixel comparing circuit (may be bypassed) for detecting motion at the pixel by checking polarities of the difference signal at an area around the target pixel and a majority detection circuit (may be bypassed) for detecting a majority of the results of the polarity deviation detection circuit to judge the motion with deviation to a side of stopping. The polarity deviation circuit may compensate the result of the peripheral pixel comparing circuit. Width of the edge signals are controlled. A noise suppression apparatus including a motion detection circuit mentioned above is also disclosed.

Motion detection circuit and a noise suppressing circuit including the same

In a motion detection circuit, a difference signal between the video and one-frame delayed video signals is generated. An Edge signal is generated from the video and delayed video signals. Motion in a target pixel is judged from the interframe difference signal according to the edge signal. A motion judging circuit further includes an LPF and a selector for supplying an output of the LPF or the difference signal. The motion judging circuit may further includes: a peripheral pixel comparing circuit (may be bypassed) for detecting motion at the pixel by checking polarities of the difference signal at an area around the target pixel; a majority detection circuit (may be bypassed) for detecting a majority of the results of the polarity deviation detection circuit to judge the motion with deviation to a side of stopping; and a polarity deviation detecting circuit for judging the motion as moving in the presence of agreement of the polarities of all pixels at any of peripheral areas around the target pixel. The size of the peripheral areas are controlled. The polarity deviation circuit may compensate the result of the majority detection circuit. Width of the edge signal is controlled. A noise suppression apparatus including a motion detection circuit mentioned above is also disclosed.

An interframe difference signal is generated from the video signal and its one-frame delayed video signal. A filter removes a carrier color signal from the interframe difference signal to output the interframe difference luminance signal. A first motion judging circuit judges a motion in the video signal at a target pixel from the interframe difference luminance signal to output a first motion judging result in accordance with a first edge detection signal. A second motion judging circuit judges a motion in the video signal at the target pixel from a luminance signal and the carrier signal in the interframe difference signal to output a second motion judging result in accordance with a second edge detection circuit. The first and second motion judging results are combined. A majority determining circuit determines majority of the combined result from adjacent Q pixels in accordance with a third edge detection signal. A circular signal generation circuit generates a coefficient K according to the result of the majority determining circuit. The interframe difference signal is multiplied with k to generate a circulation signal. A subtractor subtracts the circulation signal from the video signal to generate an output video signal of which noise is suppressed.

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Hamamatsu, Japan

Noriyoshi Kato